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Question on wood movement (twisting)

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Forum topic by ChasHutch posted 2156 days ago 741 views 0 times favorited 4 replies Add to Favorites Watch
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ChasHutch

56 posts in 2341 days


2156 days ago

Topic tags/keywords: oak planer jointer milling question

I was hoping someone could help me with this question:

I purchased some S2S 1” by ~8’ red oak from my local hardwood store about two months ago. From reading LJ’s and in magazine articles, I have learned that wood needs time to acclimate to my shop environment. I let the wood site in the shop ~7 weeks. This past weekend, I cut 14” off to make some 3/4” square slats. I dimensioned the 14”x6” piece to get it square with the jointer and surface planer. I cut the slats the next day.

My Question: After two days the slats are no longer perfectly square. They seem to have twisted a bit. It was properly dimensioned prior to ripping.

What did I do wrong and how do I avoid this in the furute? Was there moisture in the middle of the board?

I live in near Dallas, TX. The temprature has been above 90 with not too much rain. My shop is NOT temprature controlled but stays dry and the humidity has mostly been between 60 and 80%.

Any help would be apreciated.

-- Hutch - North Dallas, Tx - Safety First


4 replies so far

View Roper's profile

Roper

1357 posts in 2339 days


#1 posted 2156 days ago

once you start milling wood you need to get it cut to size and assembled as quickly as possible or else you risk your wood moving again. some tricks are to sticker your wood with a heavy weight on top and see if it will straight out or leave it in the sun and some times that will take the warp out, just use it really fast before it cups again.hope this helps.

-- Roper - Master of sawdust- www.roperwoodturning.com

View Damian Penney's profile

Damian Penney

1140 posts in 2617 days


#2 posted 2156 days ago

When you make cuts it releases internal stresses so it can move some more. Once it’s milled it’s time to get busy :)

-- I am always doing that which I can not do, in order that I may learn how to do it. - Pablo Picasso

View cmaeda's profile

cmaeda

205 posts in 2180 days


#3 posted 2155 days ago

There are a few things I learned when milling lumber, Try to take off of both sides as evenly as possible. And once milled, if you’re not going to use it right away, store it properly by either stickering it (and weighing it down) or I know a few people that wrap the wood with seran(spelling?) wrap.

View ChasHutch's profile

ChasHutch

56 posts in 2341 days


#4 posted 2155 days ago

Thanks for the responses… another lesson learned from LJ’s.

-- Hutch - North Dallas, Tx - Safety First

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